Light aluminum alloy self-locking nut

Abstract

The utility model relates to the technical field of nuts, in particular to a light aluminum alloy self-locking nut. Comprising a nut body; a central cylindrical threaded hole is formed in the nut body in the axis direction, and internal threads are arranged on the edge of the threaded hole. The nut body comprises a wrenching part and a flange part; the end face of the wrenching part is provided with six faces, self-locking closing-up points are arranged on the six faces, and the self-locking closing-up points press three points to close up. The three-point self-locking closing-up points are arranged at the midpoints of three mutually disjoint edges on the six sides, and the three-point self-locking closing-up points are connected to form an equilateral triangle. According to the self-locking nut disclosed by the utility model, three points of closing-up are pressed on six sides of the wrenching part, so that the structure of the nut is more compact, the height and the weight of the self-locking nut are greatly reduced, and under the conditions of the same specification and the same material, the same self-locking performance and the same axial load capacity can be achieved, and more uniform and stable locking torque can be provided.

Description

Technical Field

[0001] The utility model relates to the technical field of nuts, in particular to a light aluminum alloy self-locking nut. Background Art

[0002] As a commonly used threaded fastener, self-locking nuts are widely used in the fields of automotive parts, aerospace, and construction machinery. Ordinary self-locking nuts often set the closing structure on the cylindrical surface of the wrenching structure, which increases the height and weight of the self-locking nut and cannot meet the lightweight requirements of the self-locking nut. Moreover, in order to achieve the self-locking function, ordinary self-locking nuts usually set anti-slip teeth on the flange bearing surface, and use the large friction coefficient of the anti-slip teeth to fix the connected parts. However, the large friction force of the anti-slip teeth will damage the surface of the connected parts. Summary of the Invention

[0003] Aiming at the deficiencies of the existing technology, the utility model provides a light aluminum alloy self-locking nut, which performs three-point closing on six sides of the wrenching part of the self-locking nut, making the nut structure more compact, thereby achieving the effects of lightweight, good self-locking performance, and uniform and stable locking torque of the self-locking nut.

[0004] In order to achieve the above purpose, the utility model provides a light aluminum alloy self-locking nut, including a nut body; a central cylindrical threaded hole is formed in the nut body along the axial direction, and internal threads are provided at the edge of the threaded hole; the nut body includes a wrenching part and a flange part; the end face of the wrenching part is a six-sided surface, and self-locking closing points are provided on the six-sided surface, and the self-locking closing points perform three-point closing; the three-point self-locking closing points are arranged at the midpoints of three non-intersecting sides on the six-sided surface, and an equilateral triangle is formed by connecting the three-point self-locking closing points.

[0005] The self-locking nut of the utility model designs the self-locking closing points on the six-sided surface of the wrenching part, deletes the process design of closing the ordinary self-locking nut on the cylindrical surface of the wrenching part, makes the structure of the self-locking nut more compact, greatly reduces the height and weight of the self-locking nut, and can achieve the same self-locking performance and axial load under the same specifications and the same materials. After three-point closing, the threaded hole generates plastic deformation along the radial direction, so that the radial dimension of the threaded hole at the closing point is smaller than the radial dimension of the screw rod connected thereto; when the screw rod is screwed into the nut closing area, the screw thread of the screw rod is screwed and pressed with the deformed nut thread, so that elastic deformation occurs in the contact area. The self-locking nut with three-point closing overcomes problems such as nut rotation and offset during the closing process, and the locking torque generated is more uniform and stable compared with that generated by two-point and four-point closing.

[0006] Further, six outer wrenching surfaces are formed on the outside of the wrenching part. After the screw rod penetrates into the nut body, a wrench can be used manually to clamp the outer wrenching surfaces to screw and press the screw thread of the screw rod and the nut thread together.

[0007] Further, the flange portion includes a support platform and a bearing platform; the support platform has a frustum structure, and the small-diameter end of the support platform is hermetically connected to one end of the wrenching portion; the bearing platform has a round-basin structure, and the large-diameter end of the support platform is hermetically connected to one end of the bearing platform. The self-locking nut is provided with the flange portion, which enables the self-locking nut to bear a large load without failure; the support platform and the bearing platform are integrally provided, which can distribute the pressure of the self-locking nut on the connected parts, thereby reducing the possibility of damage to the connected parts.

[0008] Further, the outer side surface of the support platform includes six support inclined surfaces, and the support inclined surfaces are trapezoidal; the six support inclined surfaces are connected in sequence; the end surface of the support inclined surface coincides with the end surface of the outer wrenching surface.

[0009] Further, the end surface of the bearing platform is provided with a bearing surface; the bearing surface is flat and smooth. Compared with the ordinary self-locking nut with anti-slip teeth provided on the bearing surface, the bearing surface of the self-locking nut of the present utility model is flat and smooth, reducing the frictional force between the connected part and the self-locking nut and reducing the degree of surface abrasion of the connected part.

[0010] Further, a section of transition hole is also provided inside the end of the flange portion; the edge of the transition hole is smooth and has no threads; the transition hole is arranged coaxially with the threaded hole. The transition hole is arranged inside the end of the flange portion. When the bolt penetrates into the nut, the smooth transition hole without threads can avoid the incomplete area of the bolt, enabling the screw rod and the nut to be tightly screwed together.

[0011] Further, the diameter of the transition hole is larger than the diameter of the threaded hole; the diameter of the transition hole is 8.5 mm to 8.7 mm, and the diameter of the threaded hole is 6.75 to 6.95 mm.

[0012] Further, the angle formed by the support inclined surface and the axis line of the nut body is 45 degrees.

[0013] Further, the internal thread has a flange structure, and an inclined surface is formed on the side of the flange; the angle formed by the inclined surface of the internal thread and the axis line of the nut body is 45 degrees.

[0014] Further, the material used for the nut body is 6056-type aluminum alloy. The 6056-type aluminum alloy includes metal elements such as aluminum, copper, manganese, magnesium, chromium, etc. As the raw material of the self-locking nut, the 6056-type aluminum alloy has the characteristics of light weight, corrosion resistance, excellent mechanical properties, etc.

[0015] Beneficial effects

[0016] The self-locking nut of the present utility model is pressed and closed at three points on six sides of the wrenching part, making the structure of the self-locking nut more compact. The height and weight of the self-locking nut are greatly reduced, and under the conditions of the same specification and the same material, the same self-locking performance and axial load capacity can be achieved. The self-locking nut with three-point pressing and closing overcomes problems such as nut rotation and offset during the closing process, and the locking torque generated is more uniform and stable compared with that of two-point and four-point pressing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural view of a light aluminum alloy self-locking nut;

[0018] Figure 2 is a top view of a light aluminum alloy self-locking nut;

[0019] Figure 3 is a front view of a light aluminum alloy self-locking nut;

[0020] Figure 4 is a bottom view of a light aluminum alloy self-locking nut;

[0021] Figure 5 is a sectional view of a light aluminum alloy self-locking nut;

[0022] Figure 6 is a top view of a common self-locking nut;

[0023] Figure 7 is a partial sectional view of a common self-locking nut.

[0024] In the drawings: 1. nut body; 2. threaded hole; 3. internal thread; 4. wrenching part; 41. self-locking closing point; 42. external wrenching surface; 5. flange part; 51. support platform; 511. support inclined surface; 52. bearing platform; 521. bearing surface; 6. transition hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The embodiments of the present utility model will be described in detail below. The following described embodiments are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0026] As Figure 1 , Figure 2 shown, it includes a nut body 1; a central cylindrical threaded hole 2 is formed in the nut body 1 along the axial direction, and an internal thread 3 is provided at the edge of the threaded hole 2; the nut body 1 includes a wrenching part 4 and a flange part 5; the end surface of the wrenching part 4 is a hexagon, and self-locking closing points 41 are provided on the six sides, and the self-locking closing points 41 are pressed and closed at three points; the three-point self-locking closing points 41 are arranged at the midpoints of three non-intersecting sides on the hexagon, and an equilateral triangle is formed by connecting the three-point self-locking closing points 41.

[0027] The self-locking nut of the present utility model designs the self-locking closing point 41 on the six sides of the wrenching part 4, deleting the process design of the ordinary self-locking nut shown in Figure 6 , Figure 7 that the closing must be done on the cylindrical surface of the wrenching part 4, making the structure of the self-locking nut more compact, greatly reducing the height and weight of the self-locking nut, and being able to achieve the same self-locking performance and axial load under the same specifications and the same material conditions. After the three-point pressing closing, the threaded hole 2 generates plastic deformation along the radial direction, making the radial dimension of the threaded hole 2 at the closing point smaller than the radial dimension of the screw rod connected thereto; when the screw rod is screwed into the nut closing area, the screw thread of the screw rod is screwed and pressed with the deformed nut thread, making the contact area undergo elastic deformation. The self-locking nut is pressed with three points at the midpoints of the non-intersecting line segments on the six sides, so that the three points are connected to form an equilateral triangle. The three-point pressing closing design overcomes problems such as nut rotation and offset during the closing process, and the locking torque generated is more uniform and stable compared to pressing two points and four points.

[0028] As shown in Figure 3 , an outer wrenching surface 42 is formed on the outside of the wrenching part 4, and there are six outer wrenching surfaces 42. When the screw rod passes through the nut body 1, the outer wrenching surface 42 can be clamped manually with a wrench, so that the screw thread of the screw rod is screwed and pressed with the nut thread.

[0029] As shown in Figure 3 , the flange part 5 includes a support platform 51 and a bearing platform 52; the support platform 51 has a frustum structure, and the small-diameter end of the support platform 51 is hermetically connected to one end of the wrenching part 4; the bearing platform 52 has a round basin structure, and the large-diameter end of the support platform 51 is hermetically connected to one end of the bearing platform 52. The self-locking nut is provided with the flange part 5, which can enable the self-locking nut to bear a large load without failure; the support platform 51 and the bearing platform 52 are integrally arranged, which can distribute the pressure of the self-locking nut on the connected parts, thereby reducing the possibility of damage to the connected parts.

[0030] As shown in Figure 3 , the outer side surface of the support platform 51 includes six support inclined surfaces 511, and the support inclined surfaces 511 are trapezoidal; the six support inclined surfaces 511 are connected in sequence; the end surface of the support inclined surface 511 coincides with the end surface of the outer wrenching surface 42.

[0031] As shown in Figure 4 , the end surface of the bearing platform 52 is provided with a bearing surface

[0032] As shown in Figure 5As shown, a section of transition hole 6 is also provided inside the end of the flange portion 5; the edge of the transition hole 6 is smooth without threads; the transition hole 6 is coaxially arranged with the threaded hole 2. The transition hole 6 is arranged inside the end of the flange portion 5. When the bolt passes through the nut, the smooth and threadless transition hole 6 can avoid the incomplete area of the bolt, enabling the screw rod and the nut to be tightly screwed together.

[0033] As Figure 5 shown, the aperture of the transition hole 6 is larger than that of the threaded hole 2; the diameter of the transition hole 6 is 8.5 mm to 8.7 mm, and the diameter of the threaded hole 2 is 6.75 to 6.95 mm.

[0034] As Figure 3 shown, the included angle formed by the support inclined plane 511 and the axis line of the nut body 1 is 45 degrees.

[0035] As Figure 5 shown, the internal thread 3 has a flange structure, and an inclined plane is formed on the side of the flange; the included angle formed by the inclined plane of the internal thread 3 and the axis line of the nut body 1 is 45 degrees.

[0036] The material used for the nut body 1 is 6056 - type aluminum alloy. The 6056 - type aluminum alloy includes metal elements such as aluminum, copper, manganese, magnesium, chromium, etc. As the raw material of the self - locking nut, the 6056 - type aluminum alloy has the characteristics of lightweight, corrosion resistance, and excellent mechanical properties.

Claims

1. A lightweight aluminum alloy self-locking nut, characterized in that: It includes a nut body (1); the nut body (1) forms a central cylindrical threaded hole (2) along the axial direction, and an internal thread (3) is provided at the edge of the threaded hole (2); the nut body (1) includes a wrenching part (4) and a flange part (5); the end face of the wrenching part (4) is a hexagon, and self-locking closing points (41) are provided on the hexagon, and the self-locking closing points (41) are closed by pressing three points; the three self-locking closing points (41) are arranged at the midpoints of three non-intersecting sides on the hexagon, and an equilateral triangle is formed by connecting the three self-locking closing points (41).

2. The light aluminum alloy self-locking nut according to claim 1, wherein: An external wrenching surface (42) is formed on the outside of the wrenching part (4), and there are six external wrenching surfaces (42).

3. The light aluminum alloy self-locking nut according to claim 2, characterized in that: The flange part (5) includes a support platform (51) and a bearing platform (52); the support platform (51) has a frustum structure, and the small-diameter end of the support platform (51) is hermetically connected to one end of the wrenching part (4); the bearing platform (52) has a round basin structure, and the large-diameter end of the support platform (51) is hermetically connected to one end of the bearing platform (52).

4. The light aluminum alloy self-locking nut according to claim 3, wherein: The outer side surface of the support platform (51) includes six support inclined surfaces (511), and the support inclined surfaces (511) are trapezoidal; the six support inclined surfaces (511) are connected in sequence; the end face of the support inclined surface (511) coincides with the end face of the external wrenching surface (42).

5. The light aluminum alloy self-locking nut according to claim 3, characterized in that: A bearing surface (521) is provided on the end face of the bearing platform (52); the bearing surface (521) is flat and smooth.

6. The light aluminum alloy self-locking nut according to claim 3, wherein: A section of transition hole (6) is also provided inside the end of the flange part (5); the edge of the transition hole (6) is smooth without threads; the transition hole (6) is coaxially arranged with the threaded hole (2).

7. The light aluminum alloy self-locking nut according to claim 6, wherein: The aperture of the transition hole (6) is larger than the aperture of the threaded hole (2); the diameter of the transition hole (6) is 8.5 mm to 8.7 mm, and the diameter of the threaded hole (2) is 6.75 to 6.95 mm.

8. The light aluminum alloy self-locking nut according to claim 4, characterized in that: The included angle formed by the support inclined surface (511) and the axis of the nut body (1) is 45 degrees.

9. The light aluminum alloy self-locking nut according to claim 1, characterized in that: The internal thread (3) has a flange structure, and an inclined surface is formed on the side of the flange; the included angle formed by the inclined surface of the internal thread (3) and the axis of the nut body (1) is 45 degrees.

10. The light aluminum alloy self-locking nut according to claim 1, wherein: The material used for the nut body (1) is 6056-type aluminum alloy.

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