A safety nut
By combining internal and external tapered threads and using a shrinkage groove structure, the loosening problem of traditional spring clip anti-loosening nuts under vibration and temperature changes is solved, achieving a higher anti-loosening and self-locking effect and improving the safety and stability of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 王平安
- Filing Date
- 2025-06-24
- Publication Date
- 2026-06-23
AI Technical Summary
Traditional spring-loaded anti-loosening nuts become less effective under the influence of factors such as vibration and temperature changes, and are prone to loosening, leading to equipment failure and safety hazards.
The design incorporates both internal and external tapered threads. The inner nut has upper and lower shrinkage grooves on its outer wall, while the outer nut has internal tapered threads on its inner wall. The interlocking of the tapered threads and the shrinkage grooves enhance the clamping force of the bolt and prevent loosening.
This improves the safety of the nut in locking the bolt, preventing loosening and enhancing the stability and safety of the equipment.
Smart Images
Figure CN224396889U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of nut technology, and more specifically, to a safety nut. Background Technology
[0002] In the field of mechanical connections, the fit between nuts and bolts is a common fastening method, widely used in various mechanical equipment and structures. The reliability of this fastening directly affects the safe and stable operation of the equipment. However, traditional spring-clip anti-loosening nuts have many drawbacks. Spring-clip anti-loosening nuts mainly rely on the elastic deformation of the spring clip to provide anti-loosening force. However, in actual use, due to factors such as vibration, impact, and changes in ambient temperature during equipment operation, the elasticity of the spring clip gradually weakens, significantly reducing its anti-loosening effect. Furthermore, the fit between the spring clip and the nut / bolt requires high precision; once wear occurs or improper installation occurs, loosening can easily occur, leading to bolt connection failure, equipment malfunction, or even safety accidents. To solve these problems with traditional spring-clip anti-loosening nuts, the development of a new type of safety nut is urgently needed. Utility Model Content
[0003] In view of the above-mentioned technical problems in related technologies, this utility model provides a safety nut that can solve the above problems.
[0004] To achieve the above-mentioned technical objectives, the technical solution of this utility model is implemented as follows:
[0005] A safety nut includes an outer nut and an inner nut threaded inside the outer nut. The inner nut has an internal straight thread that mates with a bolt. The inner wall of the outer nut has an internal tapered thread. The outer wall of the inner nut is integrally formed with an external tapered thread that mates with the internal tapered thread.
[0006] Furthermore, both the internal and external tapered threads are wider at the top and narrower at the bottom.
[0007] Furthermore, the taper of the internal and external tapered threads is set to 0.1°~20°.
[0008] Furthermore, the vertical length of the inner nut is smaller than the vertical length of the inner cavity of the outer nut.
[0009] Furthermore, the outer wall surface of the inner nut 3 is provided with staggered upper and lower shrinkage grooves, with the number of upper shrinkage grooves set to 0 to 6 and the number of lower shrinkage grooves set to 0 to 6.
[0010] Furthermore, the outer wall surface of the inner nut has two upper shrinkage grooves and two lower shrinkage grooves staggered. The two upper shrinkage grooves include upper shrinkage groove A and upper shrinkage groove B, and the two lower shrinkage grooves include lower shrinkage groove A and lower shrinkage groove B.
[0011] Furthermore, the top of the outer nut is integrally molded with a concave slit.
[0012] Furthermore, internal tapered threads include single-start tapered threads in both directions and multi-start tapered threads, while external tapered threads include single-start tapered threads in both directions and multi-start tapered threads.
[0013] The beneficial effects of this utility model are as follows: The inner tapered thread of the outer nut and the outer tapered thread of the inner nut of this application device are mating tapered threads. The greater the tightening force of the safety nut, the greater the shrinkage clamping force of the inner nut of the safety nut. At the same time, the tighter the mating of the inner tapered thread of the outer nut and the outer tapered thread of the inner nut, the more secure the safety nut is in gripping the bolt without gaps. When the pressing surface moves up and down, the bolt and the safety nut will not loosen. This can solve the shortcomings of spring clip anti-loosening nuts and improve the safety locking degree of the nut to the bolt. Attached Figure Description
[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0015] The present invention will now be described in further detail with reference to the accompanying drawings.
[0016] Figure 1 It is a 3D view of the assembly of safety nuts and bolts;
[0017] Figure 2 This is the main view of the assembly of the safety nut and bolt;
[0018] Figure 3 This is a cross-sectional view of the assembly of the safety nut and bolt;
[0019] Figure 4 This is a top view of the assembly of the safety nut and bolt;
[0020] Figure 5 This is a sectional view of the outer nut;
[0021] Figure 6 This is a front view of the external structure of the inner nut.
[0022] In the picture:
[0023] 1. Outer nut; 2. Bolt; 3. Inner nut; 4. Centerline; 6. Reduction groove; 7. Internal straight thread; 8. Thread; 9. Internal tapered thread; 10. External tapered thread; 11. Upper contraction groove A; 12. Upper contraction groove B; 13. Lower contraction groove A; 14. Lower contraction groove B. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.
[0025] like Figure 1-6 As shown, this utility model discloses a safety nut, including an outer nut 1 and an inner nut 3 threaded inside the outer nut 1. The inner nut 3 has an inner straight thread 7 that mates with a bolt 2. The bolt 2 has a thread 8 on its outside that mates with the inner straight thread 7. The inner wall of the outer nut 1 has an inner tapered thread 9. The outer wall of the inner nut 3 is integrally formed with an outer tapered thread 10 that mates with the inner tapered thread 9. The inner tapered thread 9 includes single-start tapered threads in both directions and multi-start tapered threads. The outer tapered thread 10 includes single-start tapered threads in both directions and multi-start tapered threads.
[0026] Example 1: The outer tapered thread 10 of the inner nut 3 is mounted on the inner tapered thread 9 of the outer nut 1. The length of the inner nut 3 is shorter than the length of the outer nut 1, ensuring sufficient space for the inner nut 3 to rotate downwards. The constriction 6 of the outer nut 1 squeezes and locks against the inner nut 3. The inner nut 3 of the safety nut is mounted on the bolt 2. When tightening the safety nut, due to the inner tapered thread 9 and angle C of the outer nut 1, and the outer tapered thread 10 and angle A of the inner nut 3, the inner tapered threads 9 of the outer nut 1 and 10 of the inner nut 3 are mutually locked by their matching tapered threads. When tightening the safety nut, the outer nut 1 and the inner nut 3 rotate downwards simultaneously. When the safety nut moves to the pressing surface, the reaction force on the pressing surface pushes upwards. At the same time, under the action of the bolt 2, the inner nut 3 can only rotate downwards because of the inner tapered thread inside the outer nut 1. The outer tapered thread 10 of the inner nut 3 and the inner nut 9 are mating tapered threads. Since the upper contraction groove 11 and upper contraction groove B12, and the lower contraction groove B13 and lower contraction groove B14 of the inner nut 3 can contract, when tightening the safety nut, the upward thrust of the reaction force of the pressing surface causes the mutual thrust generated between the outer nut 1 and the inner nut 3, causing the inner nut 3 to rotate downward. The inner nut 3 of the safety nut contracts and clamps the bolt 2. Due to the upward thrust of the reaction force of the pressing surface, the greater the tightening force of the safety nut, the greater the contraction clamping force of the inner nut 3 of the safety nut. At the same time, the tighter the fit between the inner tapered thread 9 in the outer nut 1 and the outer tapered thread 10 of the inner nut 3, the less gap there is between the safety nut and the bolt 2. When the pressing surface moves up and down, the bolt 2 and the safety nut will not loosen, which increases the friction of the safety nut and the bolt 2 to achieve a higher anti-loosening and self-locking effect.
[0027] In the preferred technical solution, both the internal tapered thread 9 and the external tapered thread 10 are wider at the top and narrower at the bottom. That is, the inner cavity of the outer nut 1 is a tapered cavity that is wider at the top and narrower at the bottom. The inner wall of the tapered cavity is provided with an internal thread, which is the internal tapered thread 9. The outer shape of the inner nut 3 is a tapered wall that is wider at the top and narrower at the bottom. The surface of the tapered wall is provided with an external thread, which is the external tapered thread 10. The taper of the internal tapered thread 9 and the external tapered thread 10 is set to 0.1°~20°. When tightening the safety nut, the upward thrust caused by the reaction force of the pressing surface causes the mutual thrust between the outer nut 1 and the inner nut 3. The inner nut 3 rotates downward, and the inner nut 3 of the safety nut can retract the clamping bolt 2, thereby increasing the clamping and locking force.
[0028] In the preferred technical solution, the vertical length of the inner nut 3 is smaller than the vertical length of the inner cavity of the outer nut 1, ensuring that the inner nut 3 has sufficient space to rotate downwards.
[0029] In the preferred technical solution, the outer wall surface of the inner nut 3 is provided with upper shrinkage grooves and lower shrinkage grooves in an alternating manner, with the number of upper shrinkage grooves set to 0 to 6 and the number of lower shrinkage grooves set to 0 to 6.
[0030] In the preferred technical solution, the outer wall surface of the inner nut 3 has two upper shrinkage grooves and two lower shrinkage grooves staggered. The two upper shrinkage grooves include upper shrinkage groove A11 and upper shrinkage groove B12, and the two lower shrinkage grooves include lower shrinkage groove A13 and lower shrinkage groove B14. The outer wall surface of the inner nut 3 is staggered as follows: upper shrinkage groove A11, lower shrinkage groove A13, upper shrinkage groove B12, and lower shrinkage groove B14.
[0031] In the preferred technical solution, the top of the outer nut 1 is integrally formed with a concave opening 6, and the opening 6 of the outer nut 1 can be squeezed and closed to the inner nut 3.
[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A safety nut, characterized in that, Includes an outer nut (1) and an inner nut (3) with threads installed inside the outer nut (1). The inner nut (3) is installed on a bolt (2). The inner nut (3) has an inner straight thread that mates with the bolt (2). The inner wall of the outer nut (1) has an inner tapered thread (9). The outer wall of the inner nut (3) is integrally formed with an outer tapered thread (10) that mates with the inner tapered thread (9). Both the internal tapered thread (9) and the external tapered thread (10) are wider at the top and narrower at the bottom; The vertical length of the inner nut (3) is smaller than the vertical length of the inner cavity of the outer nut (1); The outer wall surface of the inner nut (3) is provided with upper shrinkage grooves and lower shrinkage grooves in an alternating manner. The number of upper shrinkage grooves is set to 0~6, and the number of lower shrinkage grooves is set to 0~6. The outer wall surface of the inner nut (3) has two upper shrinkage grooves and two lower shrinkage grooves that are staggered. The two upper shrinkage grooves include upper shrinkage groove A (11) and upper shrinkage groove B (12), and the two lower shrinkage grooves include lower shrinkage groove A (13) and lower shrinkage groove B (14).
2. A safety nut according to claim 1, characterized in that, The taper of the inner tapered thread (9) and the outer tapered thread (10) is set to 0.1°~20°.
3. A safety nut according to claim 1, characterized in that, The top of the outer nut (1) is integrally formed with a concave neck (6).
4. A safety nut according to claim 1, characterized in that, The internal tapered thread (9) includes positive and negative single-start tapered threads and multi-start tapered threads, and the external tapered thread (10) includes positive and negative single-start tapered threads and multi-start tapered threads.